郑徐高铁CRTSⅢ型板式无砟轨道结构服役状态监测

Service Status Monitoring for CRTS Ⅲ Slab Ballastless Track Stucture on Zhengzhou-Xuzhou Highspeed Railway

为掌握CRTSⅢ型板式无砟轨道结构的温度场、受力和变形规律,在郑徐高铁跨京杭大运河徐州特大桥的CRTSⅢ型板式无砟轨道结构开展监测服役状态监测的基础上,对监测数据进行了统计分析,研究表明：（1）轨道板板中温度高于自密实混凝土层和底座板;（2）轨道板上半部分温度梯度较大,下半部分温度梯度较小;（3）连续梁跨中地段轨道板板端翘曲位移高于板中翘曲位移,板端最高翘曲位移为1.9mm。连续梁梁端地段轨道板板端翘曲位移与板中翘曲位移接近;（4）随着大气温度的升高,桥梁梁缝的相对位移值逐渐减小;（5）轨道板压应力、拉应力大小变化随着温度的升高和降低而相应发生变化。

In order to master the CRTS Ⅲ slab ballastless track of temperature field, stress and deformation regularity, and based on the service status monitoring for CRTS Ⅲ slab ballastless track structure on the Xuzhou grand bridge which is across the Beijing-Hangzhou Grande Canale on the Zhengxu High Speed Railway. In this paper, the monitoring data were statistically analyzed, and the research shows that：（1）The temperature in the track plate is higher than the self-compacted concrete layer and the base plate;（2）The upper part of the track plate has a large temperature gradient and the lower part temperature gradient is smaller;（3） The warping displacement of the rail plate at the end of the continuous beam is higher than that in the plate, and the maximum warp displacement of the plate end is 1.9 mm. The warping displacement of the track plate end of the continuous beam beam ends is close to the warping displacement in the plate;（4）With the increase of atmospheric temperature, the relative displacement value of beam gap is gradually reduced;（5） The stress and tensile stress of track plate change with the increase and decrease of temperature.